CN101312508A - Satellite digital video broadcast receiving circuit and signal receiving method thereof - Google Patents

本发明为一种具多重输入端的卫星数字视频广播(DVB－S)接收电路及其信号接收方法，可接收多个低噪声降频器(LNB)所提供的卫星输入信号，以减少DVB－S系统的架设成本。DVB－S接收电路包含选择电路与结合器。选择电路包含复数个信号路径，可接收与传输复数个卫星输入信号；选择电路依据一控制信号，触发所述的这些信号路径其中之一，以输出所述的这些卫星输入信号其中之一。结合器则用以将所述的这些信号路径结合成单一路径，连接至DVB－S调谐器，以进行后续处理。

The present invention is a satellite digital video broadcasting (DVB-S) receiving circuit with multiple input terminals and a signal receiving method thereof, which can receive satellite input signals provided by multiple low noise downconverters (LNBs) to reduce the installation cost of the DVB-S system. The DVB-S receiving circuit includes a selection circuit and a combiner. The selection circuit includes a plurality of signal paths, which can receive and transmit a plurality of satellite input signals; the selection circuit triggers one of the signal paths according to a control signal to output one of the satellite input signals. The combiner is used to combine the signal paths into a single path, which is connected to a DVB-S tuner for subsequent processing.

一种卫星数字视频广播接收电路及其信号接收方法 A satellite digital video broadcasting receiving circuit and its signal receiving method

技术领域 technical field

本发明涉及的是一种卫星数字视频广播(Digital VideoBroadcasting-Satellite，简称DVB-S)，尤指一种具多重输入端的DVB-S接收电路及其信号接收方法。The present invention relates to a digital video broadcasting satellite (Digital Video Broadcasting-Satellite, DVB-S for short), especially a DVB-S receiving circuit with multiple input terminals and a signal receiving method thereof.

背景技术 Background technique

卫星数字视频广播是广泛使用的数字卫星电视传输规格，其对于每个卫星频道的信号(通常为不同频道的视讯)，先利用低噪声降频器(low noise block，简称LNB)将其降频，再送至个别的DVB-S接收器进行后续处理。图1A是背景技术的DVB-S系统的架构图，其通过天线14、19与LNB12、13分别接收两个不同卫星的信号，再分别送至DVB-S接收器10、11。换言之，对于每个LNB所接收的卫星信号，都需单独使用一个DVB-S接收器来处理，造成DVB-S系统的架设成本很高。Satellite digital video broadcasting is a widely used digital satellite TV transmission specification. For each satellite channel signal (usually a video of a different channel), it is first down-converted by a low noise block (LNB) , and then sent to individual DVB-S receivers for subsequent processing. FIG. 1A is a structure diagram of a DVB-S system in the background technology, which receives signals from two different satellites through antennas 14, 19 and LNBs 12, 13, and sends them to DVB-S receivers 10, 11 respectively. In other words, the satellite signals received by each LNB need to be processed by a separate DVB-S receiver, which results in a high cost of setting up the DVB-S system.

例如，在室内架设DVB-S系统时，若有两个房间，每个房间都要能收看卫星电视，则以两个LNB的情形，总共就需要四个DVB-S接收器，如图1B所示，LNB12、13通过分歧器(splitter)17、18，将卫星信号分送至两个房间，而每个房间都需两个DVB-S接收器(标号10、11、15与16)，才能完整收看卫星视讯。For example, when setting up a DVB-S system indoors, if there are two rooms, and each room must be able to watch satellite TV, in the case of two LNBs, a total of four DVB-S receivers are required, as shown in Figure 1B As shown, LNB12, 13 distributes satellite signals to two rooms through splitters (splitter) 17, 18, and each room requires two DVB-S receivers (labeled 10, 11, 15 and 16) to Watch satellite video in full.

发明内容 Contents of the invention

有鉴于此，本发明目的，在于提供一种具多重输入端的DVB-S接收电路，可接收多个LNB所提供的卫星输入信号，以减少DVB-S的系统成本。In view of this, the purpose of the present invention is to provide a DVB-S receiving circuit with multiple input terminals, which can receive satellite input signals provided by multiple LNBs, so as to reduce the system cost of DVB-S.

本发明公开一种DVB-S接收电路，包含：一选择电路，包含第一与第二信号路径，第一信号路径用以接收与传输第一卫星输入信号，第二信号路径用以接收与传输第二卫星输入信号，所述的选择电路依据一控制信号，触发第一与第二信号路径其中之一，以输出第一与第二卫星输入信号其中之一；以及一结合器，耦接至所述的选择电路，用以将第一与第二信号路径结合成单一路径，可连接至一DVB-S调谐器。The invention discloses a DVB-S receiving circuit, which includes: a selection circuit, including first and second signal paths, the first signal path is used to receive and transmit the first satellite input signal, and the second signal path is used to receive and transmit The second satellite input signal, the selection circuit triggers one of the first and second signal paths according to a control signal to output one of the first and second satellite input signals; and a combiner coupled to The selection circuit, used to combine the first and second signal paths into a single path, can be connected to a DVB-S tuner.

本发明另公开一种DVB-S接收电路，其包含：一射频切换器，从第一与第二低噪声降频器分别接收第一与第二卫星输入信号，并依据一控制信号，选择性地输出第一与第二卫星输入信号其中之一至一DVB-S调谐器，其中，所述的射频切换器与所述的DVB-S调谐器是整合在同一集成电路中；以及一控制单元，用以产生所述的控制信号。The present invention also discloses a DVB-S receiving circuit, which includes: a radio frequency switcher, which respectively receives the first and second satellite input signals from the first and second low-noise downconverters, and selectively Outputting one of the first and second satellite input signals to a DVB-S tuner, wherein the radio frequency switcher and the DVB-S tuner are integrated in the same integrated circuit; and a control unit, used to generate the control signal.

本发明也公开了一种DVB-S信号接收方法，包含：经由复数个信号路径接收与传输复数个卫星输入信号；依据一控制信号，触发所述的复数信号路径其中之一，以输出所述的复数卫星输入信号其中之一；以及结合信号路径成单一路径输出。The present invention also discloses a DVB-S signal receiving method, comprising: receiving and transmitting a plurality of satellite input signals via a plurality of signal paths; triggering one of the plurality of signal paths according to a control signal to output the one of the plurality of satellite input signals; and combine the signal paths into a single path output.

附图说明 Description of drawings

图1A是背景技术的DVB-S系统的架构图；Fig. 1A is the frame diagram of the DVB-S system of background technology;

图1B是显示图1A的架构应用在室内的一例；FIG. 1B is an example showing that the architecture of FIG. 1A is applied indoors;

图2是依据本发明的一实施例的DVB-S系统的架构图；Fig. 2 is an architecture diagram of a DVB-S system according to an embodiment of the present invention;

图3是本发明的DVB-S接收电路的一较佳实施例的方块图；Fig. 3 is the block diagram of a preferred embodiment of DVB-S receiving circuit of the present invention;

图4A是图3的DVB-S接收电路的第一实施例的方块图；Fig. 4A is the block diagram of the first embodiment of the DVB-S receiving circuit of Fig. 3;

图4B是图4A的DVB-S接收电路的一细部电路图；Fig. 4B is a detailed circuit diagram of the DVB-S receiving circuit of Fig. 4A;

图5是图3的DVB-S接收电路的第二实施例的方块图；Fig. 5 is the block diagram of the second embodiment of the DVB-S receiving circuit of Fig. 3;

图6是本发明的DVB-S接收电路的另一较佳实施例的方块图；Fig. 6 is the block diagram of another preferred embodiment of the DVB-S receiving circuit of the present invention;

图7是本发明的较佳实施例的信号接收方法流程图。Fig. 7 is a flowchart of a signal receiving method in a preferred embodiment of the present invention.

附图标记说明：10、11、15、16、20-DVB-S接收器；12、13、21、22-低噪声降频器；14、19、23、24-天线；17、18-分歧器；30、60-DVB-S接收电路；31-选择电路；311、312-开关；313、314、63、64-电感；315、316-低噪声放大器；32-结合器；33、62-控制单元；34-DVB-S调谐器；61-射频切换器；70～72-信号接收方法的一较佳实施例的流程。Explanation of reference numerals: 10, 11, 15, 16, 20—DVB-S receiver; 12, 13, 21, 22—low noise frequency reducer; 14, 19, 23, 24—antenna; 17, 18—branch 30, 60-DVB-S receiving circuit; 31-selection circuit; 311, 312-switch; 313, 314, 63, 64-inductor; 315, 316-low noise amplifier; 32-combiner; 33, 62- Control unit; 34-DVB-S tuner; 61-radio frequency switcher; 70-72-the flow of a preferred embodiment of the signal receiving method.

具体实施方式 Detailed ways

以下结合附图，对本发明上述的和另外的技术特征和优点作更详细的说明。The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

图2是依据本发明的一实施例的DVB-S系统的架构图，低噪声降频器(LNB)21、22从天线23、24分别接收不同卫星的信号，经过降频处理，分别输出第一卫星输入信号与第二卫星输入信号。DVB-S接收器20具有两个输入端，可分别从LNB21、22接收第一与第二卫星输入信号，欲实现以单一DVB-S接收器接收来自两个LNB的卫星信号。Fig. 2 is the frame diagram of the DVB-S system according to an embodiment of the present invention, and low-noise downconverter (LNB) 21,22 receives the signal of different satellites respectively from antenna 23,24, through down-frequency processing, outputs respectively the first A satellite input signal and a second satellite input signal. The DVB-S receiver 20 has two input terminals, which can respectively receive the first and second satellite input signals from the LNBs 21 and 22, so that a single DVB-S receiver can receive the satellite signals from the two LNBs.

图3是本发明的一较佳实施例的DVB-S接收电路30方块图，其中，DVB-S接收电路30与DVB-S调谐器34是位于图2的DVB-S接收器20中，而DVB-S接收电路30包含一选择电路31、一结合器(combiner)32与一控制单元33。选择电路31包含第一信号路径与第二信号路径，第一信号路径用以传输第一卫星输入信号，第二信号路径用以传输第二卫星输入信号。选择电路31依据控制单元33所产生的控制信号，触发第一与第二信号路径其中之一，以输出第一与第二卫星输入信号其中之一，举例而言，若触发第一信号路径，则输出第一卫星输入信号，而第二信号路径则处在禁能状态，即不输出第二卫星输入信号，反的也然。结合器32耦接至选择电路31，将选择电路31的第一与第二信号路径结合成单一路径，连接至DVB-S调谐器34，结合器32可以低成本提供良好的隔离效果，以降低第一与第二信号路径彼此间的干扰。举例而言，第一信号路径在结合器32中所经历的路径长度为第一卫星输入信号的四分之一波长或者二分的一波长，第二信号路径在结合器32中所经历的路径长度为第二卫星输入信号的四分之一波长或者二分的一波长，以确保两信号路径间的隔离效果。FIG. 3 is a block diagram of a DVB-S receiving circuit 30 in a preferred embodiment of the present invention, wherein the DVB-S receiving circuit 30 and the DVB-S tuner 34 are located in the DVB-S receiver 20 of FIG. 2 , and The DVB-S receiving circuit 30 includes a selection circuit 31 , a combiner 32 and a control unit 33 . The selection circuit 31 includes a first signal path and a second signal path, the first signal path is used to transmit the first satellite input signal, and the second signal path is used to transmit the second satellite input signal. The selection circuit 31 triggers one of the first and second signal paths according to the control signal generated by the control unit 33 to output one of the first and second satellite input signals. For example, if the first signal path is triggered, Then the first satellite input signal is output, while the second signal path is in a disabled state, that is, the second satellite input signal is not output, and vice versa. The combiner 32 is coupled to the selection circuit 31, and combines the first and second signal paths of the selection circuit 31 into a single path, which is connected to the DVB-S tuner 34. The combiner 32 can provide good isolation effect at low cost to reduce Interference between the first and second signal paths. For example, the path length experienced by the first signal path in the combiner 32 is a quarter wavelength or a half wavelength of the first satellite input signal, and the path length experienced by the second signal path in the combiner 32 is A quarter wavelength or a half wavelength of the input signal for the second satellite to ensure the isolation effect between the two signal paths.

控制单元33可依据使用者的设定，例如，要收看哪个LNB所接收的卫星信号，产生控制信号，送至选择电路31。控制单元33还提供一电源信号，经由选择电路31分别送至LNB21、22，以提供其电源。较佳地，控制单元33是一微控制器(micro controller)。The control unit 33 can generate a control signal and send it to the selection circuit 31 according to the user's setting, for example, which LNB receives the satellite signal to watch. The control unit 33 also provides a power signal, which is sent to the LNBs 21 and 22 via the selection circuit 31 to provide their power. Preferably, the control unit 33 is a microcontroller (micro controller).

图4A是图3的DVB-S接收电路30的第一实施例的方块图，选择电路31包含开关311、312、电容C1、C2、与电感313、314，控制单元33所提供的电源信号是分别经由开关311、312送至LNB21、22。电容C1、C2分别设置在第一与第二信号路径中，以隔离第一与第二信号路径中的直流(DC)信号，避免其送入结合器32。在此实施例中，电容C1、C2隔离控制单元33经由开关311、312送至第一与第二信号路径的直流电源信号，以避免馈入结合器32；而控制单元33产生的控制信号包含第一触发信号与第二触发信号，分别送至开关311、312，以控制其导通与否，举例而言，当第一触发信号使开关311导通时，第二触发信号则使开关312不导通，此时LNB21由电源信号供电运作，LNB22则无电源信号而无法运作，如此，即可触发第一信号路径、而同时禁能第二信号路径，反的也然。电感313耦接在开关311与LNB21之间，可隔离第一信号路径中的交流(AC)信号；电感314耦接在开关312与LNB22之间，可隔离第二信号路径中的交流信号。4A is a block diagram of the first embodiment of the DVB-S receiving circuit 30 of FIG. 3 , the selection circuit 31 includes switches 311, 312, capacitors C1, C2, and inductors 313, 314, and the power signal provided by the control unit 33 is They are sent to LNB21, 22 via switches 311, 312, respectively. Capacitors C1 and C2 are respectively provided in the first and second signal paths to isolate direct current (DC) signals in the first and second signal paths from being sent to the combiner 32 . In this embodiment, the capacitors C1 and C2 isolate the DC power signal sent to the first and second signal paths by the control unit 33 via the switches 311 and 312, so as to avoid feeding into the combiner 32; and the control signal generated by the control unit 33 includes The first trigger signal and the second trigger signal are respectively sent to the switches 311 and 312 to control whether they are turned on or not. For example, when the first trigger signal turns on the switch 311, the second trigger signal makes the switch 312 turn on. If it is not turned on, LNB21 is powered by the power signal to operate, and LNB22 cannot operate without the power signal. In this way, the first signal path can be triggered while the second signal path can be disabled at the same time, and vice versa. The inductor 313 is coupled between the switch 311 and the LNB21 and can isolate the alternating current (AC) signal in the first signal path; the inductor 314 is coupled between the switch 312 and the LNB22 and can isolate the AC signal in the second signal path.

开关311、312可为晶体管开关，电感313、314可为迹线(trace)电感，如第4B图所示，开关311、312为BJT晶体管，第一与第二触发信号则送至BJT晶体管的基极，以控制BJT晶体管导通与否。开关311、312也可以MOS晶体管实施，此时第一与第二触发信号则送至MOS晶体管的闸极，以控制MOS晶体管导通与否。The switches 311 and 312 can be transistor switches, and the inductors 313 and 314 can be trace inductors. As shown in FIG. 4B, the switches 311 and 312 are BJT transistors, and the first and second trigger signals are sent to the BJT transistors. Base to control whether the BJT transistor is turned on or not. The switches 311 and 312 can also be implemented by MOS transistors. At this time, the first and second trigger signals are sent to the gates of the MOS transistors to control whether the MOS transistors are turned on or not.

图5是图3的DVB-S接收电路30的第二实施例的方块图，其中，选择电路31包含低噪声放大器(low noise amplifier，简称LNA)315、316，分别设置在第一与第二信号路径中，以使第一与第二卫星输入信号达到足够的信号强度，并降低信号路径中的噪声。控制单元33所提供的控制信号包含第一触发信号与第二触发信号，分别送入LNA315、316，以选择性地触发LNA315、316，举例而言，当第一触发信号触发LNA315使其运作时，第二触发信号则禁能LNA316使其不运作，如此达到触发第一信号路径、同时禁能第二信号路径，反的也然。Fig. 5 is the block diagram of the second embodiment of the DVB-S receiving circuit 30 of Fig. 3, wherein, the selection circuit 31 comprises low noise amplifier (low noise amplifier, be called for short LNA) 315,316, are respectively arranged in the first and second In the signal path, the first and second satellite input signals achieve sufficient signal strength and reduce the noise in the signal path. The control signal provided by the control unit 33 includes a first trigger signal and a second trigger signal, which are respectively sent to the LNA315, 316 to selectively trigger the LNA315, 316. For example, when the first trigger signal triggers the LNA315 to operate , the second trigger signal disables the LNA 316 so that it does not operate, so that the first signal path is triggered while the second signal path is disabled, and vice versa.

较佳地，结合器32与DVB-S调谐器34可整合在同一集成电路(IC)中，或者，DVB-S接收电路30与DVB-S调谐器34是整合在同一集成电路中，以缩小整个DVB-S接收器20。Preferably, combiner 32 and DVB-S tuner 34 can be integrated in the same integrated circuit (IC), perhaps, DVB-S receiving circuit 30 and DVB-S tuner 34 are integrated in the same integrated circuit, to reduce The entire DVB-S receiver 20 .

图6是本发明另一较佳实施例的DVB-S接收电路60方块图，DVB-S接收电路60包含一射频切换器(RF switch)61、一控制单元62、电容C3、C4与迹线电感63、64。LNB21、22分别传输第一与第二卫星输入信号，在分别经过电容C3、C4后，馈入射频切换器61，依据控制单元62所提供的一控制信号，选择性地输出第一与第二卫星输入信号其中之一至DVB-S调谐器34。控制单元62供应一直流电源信号，经由迹线电感63、64分别供电在LNB21、22，控制单元62可为微控制器，而射频切换器61与DVB-S调谐器34可整合在同一集成电路中。Figure 6 is a block diagram of a DVB-S receiving circuit 60 of another preferred embodiment of the present invention, the DVB-S receiving circuit 60 includes a radio frequency switch (RF switch) 61, a control unit 62, capacitors C3, C4 and traces Inductance 63,64. LNB21, 22 respectively transmit the first and second satellite input signals, and after passing through the capacitors C3 and C4, they are fed into the RF switcher 61, and selectively output the first and second satellite signals according to a control signal provided by the control unit 62. One of the satellite input signals goes to the DVB-S tuner 34 . The control unit 62 supplies a DC power signal, and supplies power to the LNB21 and 22 respectively via the trace inductors 63 and 64. The control unit 62 can be a microcontroller, and the radio frequency switcher 61 and the DVB-S tuner 34 can be integrated in the same integrated circuit middle.

图2至图6的实施例都可推广至具有两个以上的输入端的情形，举例而言，图3中，选择电路31可包含N个信号路径(N≥2)，用以接收与传输N个卫星输入信号，并可依据一控制信号，触发N个信号路径其中之一，以输出N个卫星输入信号其中之一；结合器32则可将N个信号路径结合成单一路径，连接至DVB-S调谐器34。较佳地，每一信号路径在结合器32中所经历的路径长度为所述的信号路径所传输的卫星输入信号的四分之一波长或者二分之一波长。The embodiments of Fig. 2 to Fig. 6 can all be generalized to situations with more than two input terminals. For example, in Fig. 3, the selection circuit 31 can include N signal paths (N≥2) for receiving and transmitting N satellite input signals, and trigger one of the N signal paths according to a control signal to output one of the N satellite input signals; the combiner 32 can combine the N signal paths into a single path and connect to the DVB -S tuner 34. Preferably, the path length experienced by each signal path in the combiner 32 is a quarter wavelength or a half wavelength of the satellite input signal transmitted by the signal path.

图7是本发明的一较佳实施例的DVB-S信号接收方法流程图，包含下列步骤：Fig. 7 is a flow chart of the DVB-S signal receiving method of a preferred embodiment of the present invention, comprises the following steps:

步骤70：经由复数个信号路径接收与传输复数个卫星输入信号。Step 70: Receive and transmit a plurality of satellite input signals via a plurality of signal paths.

步骤71：依据一控制信号，触发所述的些信号路径其中之一，以输出所述的些卫星输入信号其中之一。Step 71: Trigger one of the signal paths according to a control signal to output one of the satellite input signals.

步骤72：将所述的些信号路径结合成单一路径输出至DVB-S调谐器。Step 72: Combine the above signal paths into a single path and output to the DVB-S tuner.

以上所述仅为本发明的较佳实施例，对本发明而言仅仅是说明性的，而非限制性的。本专业技术人员理解，在本发明权利要求所限定的精神和范围内可对其进行许多改变，修改，甚至等效，但都将落入本发明的保护范围内。The above descriptions are only preferred embodiments of the present invention, and are only illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.